About the design:
いいじゃないか (iijanaika) can be translated as something along the lines of: "Isn't it fine?" or "Isn't it OK?". Other possible translations are "Who cares?" or "Why not?".
About the t-shirt:
This Short-Sleeve T-Shirt is Unisex, and as such it is comfortable and flattering for both men and women. The shirt feels soft and lightweight, with the right amount of stretch.
• 100% combed and ring-spun cotton (heather colors contain polyester)
• Fabric weight: 4.2 oz (142 g/m2)
• Shoulder-to-shoulder taping
|Width (inches)||16 ½||18||20||22||24||26|